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Finding the Fourth Proportional to 170,078.55, 255,117.31 and 81,311.29

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Solution

The fourth proportional to 170,078.55, 255,117.31 and 81,311.29 is: 121,966.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,078.55 : 255,117.31 = 81,311.29 : x
  2. Step 2: Convert to fraction form
    170,078.55/255,117.31 = 81,311.29/x
  3. Step 3: Cross multiply
    170,078.55x = 255,117.31 × 81,311.29
  4. Step 4: Simplify right side
    170,078.55x = 20,743,918,285.74
  5. Step 5: Solve for x
    x = 20,743,918,285.74/170,078.55
  6. Step 6: Final answer
    x = 121,966.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.